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rt2800: validate step value for temperature compensation

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commit bf7e1abe43 upstream.

Some hardware has correct (!= 0xff) value of tssi_bounds[4] in the
EEPROM, but step is equal to 0xff. This results on ridiculous delta
calculations and completely broke TX power settings.

Reported-and-tested-by: Pavel Lucik <pavel.lucik@gmail.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislaw Gruszka 2012-10-25 09:51:39 +02:00 committed by Greg Kroah-Hartman
parent 7bbaeecbff
commit 75d1ac720f
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/rt2x00/rt2800lib.c
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@ -2235,7 +2235,7 @@ static int rt2800_get_gain_calibration_delta(struct rt2x00_dev *rt2x00dev)
/*
* Check if temperature compensation is supported.
*/
if (tssi_bounds[4] == 0xff)
if (tssi_bounds[4] == 0xff || step == 0xff)
return 0;
/*